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Creates a Dataset from another Dataset, discarding duplicates. (deprecated)

Use this transformation to produce a dataset that contains one instance of each unique element in the input. For example:

dataset =[1, 37, 2, 37, 2, 1])

# Using `unique()` will drop the duplicate elements.
dataset = dataset.apply(  # ==> { 1, 37, 2 }


A Dataset transformation function, which can be passed to